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Investments in Privately-held Companies (Details) (USD $) | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Aug. 31, 2011 EquityMethodInvestee
Summary of investments [Abstract] |  |  |  |
Income allocated to minority interests | $ 691,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | $ 1,145,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | $ 3,040,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |
Equity investments classified as other assets | 14,975,000 us-gaap_OtherAssetsNoncurrent | 14,801,000 us-gaap_OtherAssetsNoncurrent |  |
Beijing JiYa Semiconductor Material Co Ltd [Member] |  |  |  |
Summary of investments [Abstract] |  |  |  |
Number of employees who are also members of the board | 2 axti_NumberOfEmployeesAreAlsoMembersOfTheBoard / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = axti_BeijingJiyaSemiconductorMaterialCoLtdMember |  |  |
Number of equity investment entities |  |  |  | 1 axti_NumberOfEquityInvestmentEntities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = axti_BeijingJiyaSemiconductorMaterialCoLtdMember
Nanjing Jin Mei Gallium Co Ltd [Member] |  |  |  |
Summary of investments [Abstract] |  |  |  |
Number of employees who are also members of the board | 2 axti_NumberOfEmployeesAreAlsoMembersOfTheBoard / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = axti_NanjingJinMeiGalliumCoLtdMember |  |  |
Beijing Tongmei Xtal Technology [Member] |  |  |  |
Summary of investments [Abstract] |  |  |  |
Number of equity investment entities | 1 axti_NumberOfEquityInvestmentEntities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = axti_BeijingTongmeiXtalTechnologyMember |  |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co Ltd [Member] |  |  |  |
Summary of investments [Abstract] |  |  |  |
Number of employees who are also members of the board | 2 axti_NumberOfEmployeesAreAlsoMembersOfTheBoard / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = axti_BeijingBoyuSemiconductorVesselCraftworkTechnologyCoLtdMember |  |  |
AXT, Inc [Member] |  |  |  |
Summary of investments [Abstract] |  |  |  |
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income | 6,765,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 6,315,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 5,665,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |
Equity Method Investments [Member] |  |  |  |
Summary of investments [Abstract] |  |  |  |
Equity Method Investment by Parent | 8,095,000 axti_EquityMethodInvestmentByParent / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember | 7,537,000 axti_EquityMethodInvestmentByParent / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember |  |
Number of equity investment entities | 3 axti_NumberOfEquityInvestmentEntities / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember | 3 axti_NumberOfEquityInvestmentEntities / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember | 3 axti_NumberOfEquityInvestmentEntities / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember |
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income | 569,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember | 270,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember | 379,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember |
Net income generated by all joint ventures, consolidated and equity method investments | 2,900,000 axti_NetIncomeLossFromConsolidatedJointVenturesAndEquityMethodInvesteesAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember | 2,600,000 axti_NetIncomeLossFromConsolidatedJointVenturesAndEquityMethodInvesteesAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember | 4,700,000 axti_NetIncomeLossFromConsolidatedJointVenturesAndEquityMethodInvesteesAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember |
Equity investments classified as other assets | 8,100,000 us-gaap_OtherAssetsNoncurrent / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember | 7,500,000 us-gaap_OtherAssetsNoncurrent / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember |  |
Minority investment in consolidated joint venture, included in other assets | 4,000,000 us-gaap_MinorityInterestInJointVentures / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember | 3,400,000 us-gaap_MinorityInterestInJointVentures / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember |  |
Joint Ventures [Member] |  |  |  |
Summary of investments [Abstract] |  |  |  |
Number of consolidated joint ventures | 3 axti_NumberOfConsolidatedJointVentures / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember | 3 axti_NumberOfConsolidatedJointVentures / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember | 3 axti_NumberOfConsolidatedJointVentures / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember |
Income from three consolidated joint ventures | 3,000,000 axti_IncomeLossFromConsolidatedJointVentures / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember | 3,500,000 axti_IncomeLossFromConsolidatedJointVentures / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember | 7,400,000 axti_IncomeLossFromConsolidatedJointVentures / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember |
Income allocated to minority interests | 691,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember | 1,100,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember | 3,000,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember |
Net income from joint ventures attributable to parent | 2,300,000 axti_NetIncomeLossFromJointVenturesAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember | 2,400,000 axti_NetIncomeLossFromJointVenturesAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember | 4,400,000 axti_NetIncomeLossFromJointVenturesAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember |
Majority-owned Subsidiaries [Member] |  |  |  |
Summary of investments [Abstract] |  |  |  |
Investments, consolidated | 5,269,000 axti_InvestmentsInJointVenturesConsolidated / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember | 5,269,000 axti_InvestmentsInJointVenturesConsolidated / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember |  |
Minority Investment Entities [Member] |  |  |  |
Summary of investments [Abstract] |  |  |  |
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income | 1,528,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AffiliatedEntityMember | 1,377,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AffiliatedEntityMember | 1,281,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AffiliatedEntityMember |
Beijing JiYa Semiconductor Material Co., Ltd [Member] | Majority-owned Subsidiaries [Member] |  |  |  |
Summary of investments [Abstract] |  |  |  |
Investments, consolidated | 3,331,000 axti_InvestmentsInJointVenturesConsolidated / dei_LegalEntityAxis = axti_BeijingJiyaSemiconductorMaterialCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember | 3,331,000 axti_InvestmentsInJointVenturesConsolidated / dei_LegalEntityAxis = axti_BeijingJiyaSemiconductorMaterialCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember |  |
Percentage of ownership, consolidated method (in hundredths) | 46.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = axti_BeijingJiyaSemiconductorMaterialCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember |  |  |
Nanjing Jin Mei Gallium Co., Ltd [Member] | Majority-owned Subsidiaries [Member] |  |  |  |
Summary of investments [Abstract] |  |  |  |
Investments, consolidated | 592,000 axti_InvestmentsInJointVenturesConsolidated / dei_LegalEntityAxis = axti_NanjingJinMeiGalliumCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember | 592,000 axti_InvestmentsInJointVenturesConsolidated / dei_LegalEntityAxis = axti_NanjingJinMeiGalliumCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember |  |
Percentage of ownership, consolidated method (in hundredths) | 83.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = axti_NanjingJinMeiGalliumCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember |  |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd [Member] | Majority-owned Subsidiaries [Member] |  |  |  |
Summary of investments [Abstract] |  |  |  |
Investments, consolidated | 1,346,000 axti_InvestmentsInJointVenturesConsolidated / dei_LegalEntityAxis = axti_BeijingBoyuSemiconductorVesselCraftworkTechnologyCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember | 1,346,000 axti_InvestmentsInJointVenturesConsolidated / dei_LegalEntityAxis = axti_BeijingBoyuSemiconductorVesselCraftworkTechnologyCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember |  |
Percentage of ownership, consolidated method (in hundredths) | 70.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = axti_BeijingBoyuSemiconductorVesselCraftworkTechnologyCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember |  |  |
Xilingol Tongli Germanium Co. Ltd [Member] | Equity Method Investments [Member] |  |  |  |
Summary of investments [Abstract] |  |  |  |
Equity Method Investment by Parent | 5,351,000 axti_EquityMethodInvestmentByParent / dei_LegalEntityAxis = axti_XilingolTongliGermaniumCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember | 4,692,000 axti_EquityMethodInvestmentByParent / dei_LegalEntityAxis = axti_XilingolTongliGermaniumCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember |  |
Percentage of ownership, equity method (in hundredths) | 25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = axti_XilingolTongliGermaniumCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember |  |  |
Donghai County Dongfang High Purity Electronic Materials Co., Ltd [Member] | Equity Method Investments [Member] |  |  |  |
Summary of investments [Abstract] |  |  |  |
Equity Method Investment by Parent | 1,723,000 axti_EquityMethodInvestmentByParent / dei_LegalEntityAxis = axti_DonghaiCountyDongfangHighPurityElectronicMaterialsCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember | 1,900,000 axti_EquityMethodInvestmentByParent / dei_LegalEntityAxis = axti_DonghaiCountyDongfangHighPurityElectronicMaterialsCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember |  |
Percentage of ownership, equity method (in hundredths) | 46.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = axti_DonghaiCountyDongfangHighPurityElectronicMaterialsCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember |  |  |
Emeishan Jia Mei High Purity Metals Co., Ltd [Member] | Equity Method Investments [Member] |  |  |  |
Summary of investments [Abstract] |  |  |  |
Equity Method Investment by Parent | $ 1,021,000 axti_EquityMethodInvestmentByParent / dei_LegalEntityAxis = axti_EmeishanJiaMeiHighPurityMetalsCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember | $ 945,000 axti_EquityMethodInvestmentByParent / dei_LegalEntityAxis = axti_EmeishanJiaMeiHighPurityMetalsCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember |  |
Percentage of ownership, equity method (in hundredths) | 25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = axti_EmeishanJiaMeiHighPurityMetalsCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember |  |  |

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